关于Ignite的介绍,这边推荐三个链接进行学习了解。
https://ignite.apache.org/,首选还是官网,不过是英文版,如果阅读比较吃力可以选择下方两个链接。
https://www.oschina.net/p/apache-ignite?hmsr=aladdin1e1,开源中国上对Ignite的介绍,包含特性、架构等内容,比较详细。
https://www.infoq.cn/article/apache-ignite-explorer,这个链接中将Ignite与Redis、Hazelcast等同类型产品做了比较。
接下来我们开始实践,首先需要在本地搭建一套Ignite服务,从官网上可以进行下载,https://ignite.apache.org/docs/latest/installation/installing-using-zip:
这里需要注意的是,我们要下载的是安装包,别下载了源码。下载完毕后解压,去到apache-ignite-2.8.1in目录双击ignite.bat即可启动服务:
打印上图中框出内容即为启动成功,接下来我们创建一个Spring Boot项目用于整合Ignite的相关验证,目录结构如下:
父工程的pom:
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.22.RELEASE</version> <relativePath/> </parent> <properties> <h2.version>1.4.197</h2.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
Spring Boot的版本推荐为1.5.X这类较为稳定的版本,从2.0.0开始的版本和Ignite会发生冲突,编译时抛出如下错误:
Error:(8, 8) java: 名称冲突: org.apache.ignite.springdata.repository.IgniteRepository中的deleteAll(java.lang.Iterable<ID>)和org.springframework.data.repository.CrudRepository中的deleteAll(java.lang.Iterable<? extends T>)具有相同疑符, 但两者均不覆盖对方
这里还需要注意一点,如果不指定h2的版本为1.4.197,启动应用时会抛出如下异常:
org.apache.ignite.internal.processors.query.IgniteSQLException: Failed to initialize system DB connection: jdbc:h2:mem:b9189e84-4966-4b03-8500-429a958cee4f;LOCK_MODE=3;MULTI_THREADED=1;DB_CLOSE_ON_EXIT=FALSE;DEFAULT_LOCK_TIMEOUT=10000;FUNCTIONS_IN_SCHEMA=true;OPTIMIZE_REUSE_RESULTS=0;QUERY_CACHE_SIZE=0;MAX_OPERATION_MEMORY=0;BATCH_JOINS=1;ROW_FACTORY="org.apache.ignite.internal.processors.query.h2.opt.H2PlainRowFactory";DEFAULT_TABLE_ENGINE=org.apache.ignite.internal.processors.query.h2.opt.GridH2DefaultTableEngine
at org.apache.ignite.internal.processors.query.h2.ConnectionManager.connectionNoCache(ConnectionManager.java:213) ~[ignite-indexing-2.8.1.jar:2.8.1]
at org.apache.ignite.internal.processors.query.h2.ConnectionManager.<init>(ConnectionManager.java:152) ~[ignite-indexing-2.8.1.jar:2.8.1]
at org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.start(IgniteH2Indexing.java:2114) ~[ignite-indexing-2.8.1.jar:2.8.1]
at org.apache.ignite.internal.processors.query.GridQueryProcessor.start(GridQueryProcessor.java:256) ~[ignite-core-2.8.1.jar:2.8.1]
at org.apache.ignite.internal.IgniteKernal.startProcessor(IgniteKernal.java:1978) ~[ignite-core-2.8.1.jar:2.8.1]
at org.apache.ignite.internal.IgniteKernal.start(IgniteKernal.java:1212) ~[ignite-core-2.8.1.jar:2.8.1]
子模块spring-boot-test-ignite中需要添加Ignite的依赖,版本需要与本地搭建的Ignite服务保持一致:
<dependency> <groupId>org.apache.ignite</groupId> <artifactId>ignite-spring-data</artifactId> <version>2.8.1</version> </dependency>
接下来贴出Ignite的配置类IgniteConfig,通过动态IP发现绑定到本地的Ignite服务,同时创建实例与缓存供本地访问:
@Configuration class IgniteConfig { @Bean public Ignite igniteInstance() { TcpDiscoverySpi spi = new TcpDiscoverySpi(); TcpDiscoveryVmIpFinder ipFinder = new TcpDiscoveryVmIpFinder(); ipFinder.setAddresses(Arrays.asList("127.0.0.1:47500")); spi.setIpFinder(ipFinder); IgniteConfiguration igniteConfig = new IgniteConfiguration(); igniteConfig.setIgniteInstanceName("TestInstance"); igniteConfig.setDiscoverySpi(spi); igniteConfig.setClientMode(true); CacheConfiguration cacheConfig = new CacheConfiguration("TestCache"); cacheConfig.setIndexedTypes(Long.class, TestObject.class); igniteConfig.setCacheConfiguration(cacheConfig); return Ignition.start(igniteConfig); } }
用于数据交互的测试类TestObject,注解@QuerySqlField的作用时告诉Ignite后续可以通过id字段发起查询,如果没有此注解也不影响数据的插入,但是查询时会抛出Column not found的异常:
public class TestObject { @QuerySqlField(index = true) long id; String name; public TestObject(long id, String name) { this.id = id; this.name = name; } public long getId() { return id; } public void setId(long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
通过实现IgniteRepository来创建查询方式:
@RepositoryConfig(cacheName = "TestCache") public interface TestRepository extends IgniteRepository<TestObject, Long> { TestObject findById(long id); }
再下来是用于测试的接口及其对应实现:
public interface TestService { TestObject save(TestObject testObject); TestObject findTestObjectById(long id); }
@Service public class TestServiceImpl implements TestService { @Autowired TestRepository testRepository; public TestObject save(TestObject testObject) { return testRepository.save(testObject.getId(), testObject); } public TestObject findTestObjectById(long id) { return testRepository.findById(id); } }
倒数第二步是编写用于测试的controller层:
@RestController public class TestController { @Autowired TestService testService; @RequestMapping("/test") public TestObject savePerson(@RequestParam(value = "id") long id, @RequestParam(value = "name") String name) { return testService.save(new TestObject(id, name)); } @RequestMapping("/find") public TestObject findByCode(@RequestParam(value = "id") long id) { return testService.findTestObjectById(id); } }
启动类中需要注意添加注解@EnableIgniteRepositories,否则应用是无法识别通过@RepositoryConfig修饰的Bean:
@SpringBootApplication @EnableIgniteRepositories public class IgniteApplication { public static void main(String[] args) { SpringApplication.run(IgniteApplication.class, args); } }
启动应用后通过postman进行测试验证,首先创建一个TestObject的实例并塞入Ignite:
接下来通过id=12032进行查询:
成功返回!
整个实践过程中踩了不少坑,也是希望这篇随笔能为后面学习这块内容的同学节省一些时间吧。
参考资料:
https://ignite.apache.org/
https://www.oschina.net/p/apache-ignite?hmsr=aladdin1e1
https://www.infoq.cn/article/apache-ignite-explorer
https://blog.csdn.net/ltl112358/article/details/79399026
https://blog.csdn.net/qq_35051298/article/details/81452550
https://stackoverflow.com/questions/52652162/ignite-wont-start-with-spring-boot-2-0-5-h2-property-nested-joins-doesnt-exi
http://cn.voidcc.com/question/p-ofvlepsc-dr.html
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原文链接:https://www.cnblogs.com/xuzichao/p/15414019.html